nonlinearSystemPdf.cpp

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// $Id: nonlinearanalyticconditionalgaussianmobile.cpp 5823 2005-10-27 13:43:02Z TDeLaet $
// Copyright (C) 2006  Tinne De Laet <first dot last at mech dot kuleuven dot be>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//

#include "nonlinearSystemPdf.h"
#include <wrappers/rng/rng.h> // Wrapper around several rng libraries

#define SYSMODEL_NUMCONDARGUMENTS_MOBILE 2
#define SYSMODEL_DIMENSION_MOBILE        3

namespace BFL
{
  using namespace MatrixWrapper;

  NonlinearSystemPdf::NonlinearSystemPdf(const Gaussian& additiveNoise)
    : ConditionalPdf<ColumnVector,ColumnVector>(SYSMODEL_DIMENSION_MOBILE,SYSMODEL_NUMCONDARGUMENTS_MOBILE)
  {
    _additiveNoise = additiveNoise;
  }


  NonlinearSystemPdf::~NonlinearSystemPdf(){}


  bool NonlinearSystemPdf::SampleFrom (Sample<ColumnVector>& one_sample, int method, void * args) const
  {
    ColumnVector state = ConditionalArgumentGet(0);
    ColumnVector vel   = ConditionalArgumentGet(1);

    // system update
    state(1) += cos(state(3)) * vel(1);
    state(2) += sin(state(3)) * vel(1);
    state(3) += vel(2);

    // sample from additive noise
    Sample<ColumnVector> noise;
    _additiveNoise.SampleFrom(noise, method, args);

    // store results in one_sample
    one_sample.ValueSet(state + noise.ValueGet());

    return true;
  }

}//namespace BFL